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### _Why are the changes needed?_
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Add executeScala api for KyuubiStatement, so that user can invoke this method to execute scala code directly.
### _How was this patch tested?_
- [x] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [ ] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1714 from turboFei/execute_scala.
Closes#1714
a62616df [Fei Wang] Add executeScala api for KyuubiStatement
Authored-by: Fei Wang <fwang12@ebay.com>
Signed-off-by: Fei Wang <fwang12@ebay.com>
36b95d333f